Monoazo reactive dyes



United States Patent 3,169,124 MONOAZO REACTWE DYES Hans Escher and Hans Siegrist, both of Basel, Switzerland, assignors to Sandoz Ltd. (A/K/ A Sandoz AG.), Basel, Switzerland No Drawing. Filed st. 5, 1961, Ser. No. 143,059 Claims priority, application Switzerland, Oct. 6, 1969, 11,221/60 6 Claims. (Cl. 26ll-163) This invention relates to dyes of the formula -CH NHCOR OSO R n In this formula D represents the radical of a dye, e.g. of a water-soluble monoazo or disazo dye,

R an aliphatic, aliphatic-aromatic or aliphatic-cycloaliphatic chain member which may be substituted and may containhetero atoms,

R a low molecular alkyl radical which may be substituted,

a low molecular dialkylamino radical, or an aryl radical of the benzene or naphthalene series which may be substituted.

in reacting dyes possessing exchangeable hydrogen atoms, or organic compounds possessing exchangeable hydrogen atoms and in addition at least one substituent capable of dye formation, with a compound of the formula in which Y represents OH or OSO R and Z represents OH, chlorine or bromine, and converting the reaction products, when they contain radicals of organic compounds with substituents capable of dye formation, into dyes in any desired order, or, when Y stands for OH, into their sulfonictacid esters.

The compounds of Formula Hi can be obtained from the corresponding carboxylic acid amides of the formula by condensation with formaldehyde in the normal manner in neutral to weakly alkaline aqueous solution or suspension, e.g. at room temperature and up to about 100 C. and in presence of trimethylor triethylamine, barium hydroxide or other basic or acid catalysts.

It is not however necessary to use the previously prepared compound of Formula III as reactant. In its place a compound of the formula Y-R -CO-NH (IV) together with symmetrical dihalogenodimethyl ether, can be employed. It is preferable to use about /2 mol of the ether to each mol of compound (IV), though an excess of the ether can be added if desired.

Azo dyes which are of special interest for the new process are those which contain in the diazo or coupling component unsulfonated aryl radicals of the benzene, diphenyl or naphthalene series, e.g. the radical of aminobenzene, l-amino-2-, 3- or 4-methyl, -chloro-, -bromo-, -methoxy-, -ethoxy-, -acetylamino-, -propionylamino-, carbomethoxyamino-, carbethoxyaminobenzene, l-arnino-2,4-, -2,5- or -2,6-dimethylbenzene, 1amino2,4,6-trimethylbenzene, 1- amino-2,3- or 3,4-tetramethylenebenzene, 1- or Z-aminonaphthalene, 4-amino-1,1-diphenyl, 4,4'-diamino-1,1-diphenyl. V

The preferred dyes of these large groups have the general Formula I, in which D represents the radical of a water-soluble monoazo or disazo dye, and

R represents an aliphatic chain member which may be substituted, and R a low molecular alkyl or aryl radical which may be substituted by halogen.

The symmetrical dichloroor dibromodimethyl ethers are particularly advantageous.

The reaction of the dye or of its preliminary product with the dihalogenodimethyl ether and the acid amide of Formula IV is eifected with stoichiometric amounts of the reactants or with an excess of the ether and the amide, which improves the yields.

The production of the dyes is carried out to advantage in presence of an agent which splits off water, e.g. 80 to 100% sulfuric acid or chlorosulfonic acid, at temperatures of 0 to about C. for several hours. The sulfonic acid esters obtained can be isolated, for example, by salting out; it is best to filter them with suction and they are then washed with sodium chloride solution until neutral and dried.

The dyes obtained form a chemical linkage with the fiber and dye wool, silk, synthetic polyamide fibers, leather, and fibers of natural and regenerated cellulose by exhaustion dyeing, padding or printing processes in shades fast to light, milling, water, washing, perspiration, chlorine, dry cleaning, alkali, rubbing and cross dyeing.

They can be fixed on the fiber by alkaline treatment, the normal method for reactive dyes. Without fixation treatment of this type, however, the dye show good building-up properties on animal fibers and synthetic polyamide fibers and give dyeings with the good fastness properties mentioned above.

In the following examples the parts and percentages are by weight and the temperatures in degrees centigrade.

EXAMPLE 1 43.6 parts of the monoazo dye obtained by coupling 1-diazo-2,4 limethylbenzene with l-hydroxynaphthalene- 3,6-disulfonic acid in alkaline medium, are dissolved in 300 parts of sulfuric acid at 15-20. 27.3 parts of p-tosyl-a-oxypropionic acid methylol amide are added in small portions with stirring and the temperature raised to 3 3540. As soon as no further starting dye is indicated, the reaction mass is cooled to about 15 and run into 3000 parts of ice. The precipitated dye is filtered off, converted into the sodium salt, isolated, and dried at low temperature with vacuum.

The new dye is an orange-brown powder which dissolves in water with a scarlet coloration. Dyed on wool from a weakly acid bath, if necessary with the addition of a levelling agent, it gives very brilliant level shades of good fastness to light and washing.

In place of the P-tOSYl-OL-OXYPIOPiOHiC acid hydroxy- Inethylamide used in this example, the corresponding ptosyl-fi-oxy derivative can be used to give a dye with very similar properties.

The p-tosyl-a-oxypropionic acid hydroxymethylamide used in this example can be obtained, for example, from p-tosyl-m-oxypropionic acid chloride by reaction with ammonia to give the corresponding acid amide and subsequent condensation with formaldehyde at room temperature in a neutral to Weakly alkaline medium, if necessary in the presence of a catalyst such as triethylamine.

EXAMPLE 2 54.1 parts of the monoazo dye obtained by coupling diazotized 1-aminobenzene-2-sulfonic acid with 2-(2',4,

6' trimethyl)-phenylamino-8-hydroxynaphthalene 6-sulfonic acid in acid medium, are dissolved in 500 parts of 96% sulfuric acid at 15-20 with stirring. The solution is cooled to 1-5 and 26 parts of O-(p-toluylsulfonyl)- glycolyl-N-methylol amide are added in small portions. After this addition it is constantly stirred until it reaches room temperature. Stirring is continued for 2 hours, then the solution is poured onto 1800 parts of ice and the precipitated dye filtered off. It is purified by dissolving in 2000 parts of water and precipitation with 400 parts of common salt, this procedure being repeated twice.

The isolated dye is washed with common salt solution and dried with vacuum. It is a red-colored powder which dyes nylon and wool in red shades fast to light and wet treatments.

When in place of 26 parts of O-(p-toluylsulfonyl)-glycolyl-N-methylol amide, 129 parts of the sulfuric acid condensation solution of O-(-toluylsulfonyl)-glycolic acid amide and a,u'-dichlorodimethyl ether are used, the identical dye is obtained.

In the following table are enumerated further dyes which can be produced in an analogous way. They are characterized by their diazo and coupling components, the coupling medium, the reaction medium, and the shade of their dyeings, on wool and cotton.

Example Coupling Shade on N o. Diazo Component Coupling Component Medium Reaction Medium 60% and 3 1-aminobenzene-2,fi-disulfonic acid... 1-(2,4-dirncthyl)-phcnyl-3-mcthyl- Alkaline O-(p-toluyl-sulfonyl)-glycolyl-N- Yellow.

ii-pyrazolone. methylol amide. 4 1-aminobcnzenc-2-sulionie acid. 2(2,4-dimethyl)-pl1enylamino-8- Acid O-(methylsulfonyl)-glycolyl-N- Red.

hygroxynaphthalene-G-sulionic rnethylolamide. aci 5 ..d0 do do. O-(p-bromophenylsulfonyl)-glycolyl- Do.

N -methylolamide. 6 .110 d0 O-(p-toluylsulfonyl)-3-oXypropi0nyl- D0.

N-methylolamide. -7 d0 .d0 do 0-(p-to1uy1sulfonyl)-2-oxypropionyl- D0.

-, N-methylolamide. 8 .d0 -.d0 "do"... 0-(p-toluylsulfonyD-glycolyl-N- D0.

. chloromethylamide. 9 2-aminobcnzenc-l-sulfomc acid 2-(4-methyl)-phenylamino-8- d0. C111orophenylsultonyl-glycolyl-N- Do.

hydlroxynaphthalene-fi-sulfonic methylolamide. acic 10 .do 1-(4-methyl)-phcnylamino-8- Alkaline... do Violet.

hygroxynaphthalene-tsulfonic aci 11 do 2-(2-4-dimethyl)-phenylamino-5- Acid do Orange.

, phenylsulfonyloxynaplithalene- 7-sulionic acid. do 1 (4 methyl) plicnyl 3 metliyl- Alkaline O (p toluylsulfonyl) glycolyl N- Yellow.

fi-pyrazolonc. methylolamide. 2- amino- 5- chloro -benzenel sul- 2- (2, 4, 6 trlmethyl) -phenylami- Acid do Red.

ionic acid.

no 8 hydroxynaphthalenc 6- sullonic acid. 4-aminobenzene-l-sulfonic acid d0 Do. Q-aminobenzene-l-sulionic acid 1 (2 chloro 4, 6' dimethyl)- Yellow.

phenyl-3-methyl-5-pyrazolone. do 1- (4 methoxy) phenyl 3 meth- D0.

yl-fi-pyrazolone. Lamina-2,et-dimcthyl-benzene 1 hydroxynaphthalenc 3, 6 disul- O (methyl suli'onyl) glycolyl N Red.

ionic acid. chloromethylamide. 18 ..d0 ..do O (methylsulfonyl) glyeolyl N- Do.

methylola-mide. 19- do d0 ..d0 O (methylsulfonyl) 3 oxypropio- Do.

nyLN-methylolamide. 20 .do ..d0 do O (pbromo henylsulfonyl) 2- oxy- D0.

propionyl- -methylolamido. 21 l-aminoA-methoxybenzeue 1- hydrox maphthaleue 4, 6 disuldo O (methylsulionyl) glycolyl N- Do.

, Ionic acid. methylolamide. 22 do 1 hydroxy 8 acetyl aminonaphdo do Blnish tlialene-3,G-disu1f0nic acid. red. 23 1-aminc-3-chl0robenzene 1 hydroxy 8 benzoylamlno 3, tidn rio Red.

(lisulionic acid. 24 1 amino 5 O (p t0luylsulfonyl)- 1 hydrorynaphthalene 3, 6 disul- .do do Do.

glycolylamino-methyl-benzene. Ionic acid. 25 1 amino 4- ethoxy- 3- O (p tol- 1 phenyl 3 methyl 5 pyra-zo- Yellow ibiylsulfonyl) glycolaminomethyllone-3-sull'onic acid.

enzene.

Formulae of representative dyes of the foregoing examples are as follows:

Example 1 HO3S- S0313:

Example 2 SOaH Example 3 Example 9 SOSH Example I C-N- CH3 Example 21 Example 23 Example 25 I Having thus disclosed the invention, what We claim is: R is a divalent radical selected fiom the group con- 1. A monoazo dye of the formula sisting of AM I CH -NH-C OR20S 02-11, R

3 -o=c 7 OH R(nl) v 1 i N and naphthylene-amino- But-1) =N 803E wherein A is a member selected from the gmup consisting (3H3 of sulfo-hydroxynaphthyl and l-sulfophenyl-S-pyrazolonyl, -aminobeing bound to a different nucleus than B is sulfophenyl, -OH,

7 8 R is a member selected from the group consisting of 3. The reactive dye of the formula -CHg, -CHzCHn-, -CH3NHCHzCHzand 10 I OH- $03K 4. The reactive dye of the formula Cl HO I CH3 R is a member selected from the group consisting of 5. The reactive dye of the formula methyl, phenyl, methylphenyl, chlorophenyl and bromophenyl, the nucleus D contains 1 to 3 substituents selected from the group consisting of methyl, methoxy, ethoxy and 25 chlorine, the said -CH -NH-COR --O-SO -R group being in ortho-position to one of the last-named cH, s0,-o-cI-n-00-N11-0H2 substituents, and n is one of the integers 1 and 2.

2. The reactive dye of the formula SlO H NEE-- CH 6. The reactive dye of the formula References Cited in the file of this patent UNITED STATES PATENTS 2,975,167 Schwander Mar. 14, 1961 FOREIGN PATENTS 1,245,115 France Sept. 26, 1960 OTHER REFERENCES Wegmann, J.: Textil-Praxis, October 1958, pages 1056- 1061. 

1. A MONOAZO DYE OF THE FORMULA 